LOS ANGELES—The edgy, avant-pop album that siblings Billie Eilish and Finneas created in a small bedroom made a big splash at the 2020 Grammy Awards, winning 11 honors for the musical family.

U.S. singer-songwriter Billie Eilish poses in the press room with the awards for Album Of The Year, Record Of The Year, Best New Artist, Song Of The Year and Best Pop Vocal Album during the 62nd Annual Grammy Awards in Los Angeles on Jan. 26, 2020. FREDERIC J. BROWN/AFP via Getty Images
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